Microsoft Teams is one of the most popular team chats. You can connect it to Zammad (as well as any other Microsoft Teams-compatible chat) and receive a message every time there is a ticket update. This way it's super easy to keep an eye on everything - and never miss a message or deadline.
Important Update: The Microsoft Teams Integration is now a predefined webhook. Therefore you can now set this application via the webhooks. You can find more information here: Webhooks